PagoPA ESLint config

This package provide the following ESLint custom rules for Typescript projects.

• recommendend
• react
• strong

This repository replace italia-tslint-rules after TSLint deprecation.

The following TSLint rules (included inside italia-tslint-rules) are not supported for eslint at the moment and are missing in this package:

bool-param-default
max-union-size
no-accessor-field-mismatch
no-array-delete // Mitigated by no-delete
no-case-with-or
no-dead-store
no-duplicate-in-composite
no-empty-array
no-extra-semicolon // Mitigated by prettier
no-empty-destructuring // Mititgated by no-empty-pattern
no-gratuitous-expressions
no-hardcoded-credentials
no-ignored-initial-value // Mitigated by no-param-reassign, no-let
no-in-misuse
no-inferred-empty-object-type
no-invalid-await // Mititgated by await-thenable
no-invariant-return
no-misleading-array-reverse // Mitigated by immutable-data
no-misspelled-operator // Mitigated by prettier
no-nested-switch
no-nested-template-literals
no-statements-same-line // Mitigated by prettier
no-try-promise
no-tslint-disable-all
no-unconditional-jump
no-undefined-argument
no-unenclosed-multiline-block // Mitigated by prettier
no-unthrown-error
no-unused-array // Mitigated by no-unused-vars
no-useless-increment
no-useless-intersection
prefer-promise-shorthand
promise-must-complete
use-primitive-type

This list has been produced following these steps:

1. Follow TSLint to ESLint migration guide on the project io-backend
2. Running npx tslint-to-eslint-config that produces a list of TSLint rules not available for ESLint (77 rules at the moment)
3. Manually check each one for an alternative ESLint rules/plugins
4. Verify each alternative ESLint rule/plugin on a testing file

Usage

Installation and Configuration

To use this package install as devDependecy inside any typescript project with

yarn install -D @pagopa/eslint-config

Create on the project an .eslintrc.js file with the following content

module.exports = {
  "extends": [
    "@pagopa/eslint-config/strong",
  ],
  "rules": {
    // Any project level custom rule
  }
}

Add inside the package.json file a lint and optionally a lint-autofix script as:

"scripts": {
  "lint": "eslint . -c .eslintrc.js --ext .ts,.tsx",
  "lint-autofix": "eslint . -c .eslintrc.js --ext .ts,.tsx --fix",
  ...
}

Migration from TSLint

Remove from the package.json every tslint reference:

• tslint
• italia-tslint-rules

Replace all the // tslint:disable-next-line with the proper // eslint-disable-next-line comment. If are present some // tslint:disable replace it with /* eslint-disable */ at the top of the file.

If you need to disable ESLint for some files create .eslintignore file with the list of folders or files that must be excluded from lint process. Copy the exclusion from tslint.json linterOptions.exclude

Delete all tslint related files (es. tslint.json).

Run yarn lint-autofix to refactorize the code automatically with all the auto-fixable ESLint rules.